Medical instrument for measuring heart rate



FIG. 1 is a perspective top and side view of a medical instrument for measuring heart rate according to my new and ornamental design,

FIG. 2 is a perspective bottom and opposite side view thereof,

FIG. 3 is a top plan view thereof,

FIG. 4 is a bottom plan view thereof,

FIG. 5 is a first side view thereof,

FIG. 6 is an opposite, second side view thereof; and,

FIG. 7 is a partially exploded view thereof. 

CLAIM The ornamental design for a medical instrument for measuring heart rate, as shown and described. 